GAMS World Forum

If you want some help, you need to send something one can reproduce.

-Michael

The problematic construct is sum((t,q)$Rc(i) where Rc is a variable. GAMS does not allow an endogenous parameter, i.e. a variable in a $ expression. We see this oven with binary variables. Such constructs can be rewritten with regular algebra. In your case, I don't even know what this should mean, b...

That is serious. You can suppress the domain violation by only taking records that match your sets by replacing $loadDC by $load. This is extremely dangerous, since you have no clue of what you leave behind, so the results of the model are very questionable. If you have to use a complex model like I...

I think the error is clear from the message, your symbol QHTAB has been declared over some sets (probably H,XC) that do not include the element 'init' (or 'base' or 'total') and hence the compiler gives you an error. Look at the declaration of QHTAB and confirm that the domain sets do not include 'i...

gdxxrw is supported on Windows only, see https://www.gams.com/latest/docs/T_MAIN.html#GAMS_TOOLS_SUPPORTED_PLATFORMS. If you need to read/write Excel files independent of Windows and Excel, check out GAMS/Connect (still in beta and subject to change): https://www.gams.com/latest/docs/UG_GAMSCONNECT....

Hi GAMS Users,

We started distributing GAMS Release 43.1.0 on April 27, 2023.

You can download the software from https://www.gams.com/download/

Here are the release notes: https://www.gams.com/latest/docs/RN_43.html

Your GAMS Team
www.gams.com

GAMS has no defining variables, so you need to write your X(i) := A(i)*e(i) as regular equality constraints. Only if you have a constant expression on the right (as for Xexp(i) := 0) you can "fix" the variable" using the .fx suffix: "Xexp.fx(i) := 0;". Here is the equation c...

Without Excel file (or GDX file) this is hard to run to see where your problem is. You can also make a version with dummy data. -Michael

Why don't you share your non-working attempts (i.e. your compilable and executable GAMS model) and point to a "smoking gun" (show what does not work). Perhaps, then you get more feedback. -Michael

The execSeed "function" (https://www.gams.com/latest/docs/UG_Par ... 1_function) allows to set the random seed in a regular assignment: "execSeed = MODEL_SETTINGS("random_seed");"

-Michael